Under normal circumstances, it is normal for newborns to breathe through their mouths with nasal congestion. Newborns nasal cavity is relatively small and delicate mucosa, the respiratory tract is also relatively short, the air in the dust is easy to enter the nasal cavity, resulting in the nasal cavity is stimulated by the swelling that occurs at this time the newborns nasal secretions are more, easy to block the nasal cavity, resulting in mouth breathing behavior, which is a normal situation. Need to pay attention to the temperature and humidity of the newborn’s room, the temperature of the newborn’s room is best between 24 ℃ ~ 26 ℃ is more appropriate, the humidity is best 50% ~ 60% is more appropriate. In the right temperature and humidity environment newborns live more comfortable, nasal congestion may occur less likely. If a newborn’s nasal congestion breathing through the mouth is serious, or accompanied by other symptoms, it is recommended to go to the hospital in time to avoid delayed treatment.